Note. The connecting rod head bearings are different from the connecting rod cap bearings. Pay attention to the repair size of the crankshaft.
Checking the radial clearance (0.020—0.055 mm) and the replacement of the crankshaft connecting rod bearing shells should be carried out in the same way as the replacement of the main bearing shells, subject to the following.
Prepare fixtures «00.2.590», «00.9.120» And «11.2.110» and take out the pistons. Into the lid (12, see fig. 3.11) connecting rod install a new standard bearing (11) with red marking, in the lower end of the connecting rod (8) install liner (10) with blue marking (regardless of the color marking of the connecting rod).
1 - bearing; 2, 11 - centering sleeve (∅14,5); 3 - pin; 4 - bolt (M12x1.5x50); 5 - flywheel; 6 - bolt (M12x1.5x28); 7 - driven disk; 8 - spacer washer; 9 - ring gear; 10 - bolt (M10x17.5)
Install the pistons in the cylinder block and check the radial clearance (left arrow, fig. 3.93) by flattening the calibration wire, between the liners and the connecting rod neck, which should be within 0.020-0.055 mm.
To do this, set the piston to the BDC position. Install fixture «00.2.590» (Plastigage PG-1) on the oil-free surface of the connecting rod journal of the crankshaft.
Attachment 00.2.590
The connecting rod head caps are paired with the connecting rod and are not subject to dismantling. The tightening order for the connecting rod bearing cap bolts is as follows:
- tighten torque 5.0 km (0.5 kgf·m);
- tighten to 20.0 Nm (20 kgf·m);
- tighten the bolts by an angle of 70°.
For this purpose, use the old connecting rod cap bolts; to turn the bolts, use the tool «00.9.120» or «11.2.110».
Attachment 00.9.120
Attention! When tightening the bolts, do not allow the connecting rod or crankshaft to move.
Remove the connecting rod bearing cap, and measure the radial clearance across the width of the flattened plastic gauge wire (arrow, see fig. 3.92) according to the measuring scale.
If necessary, to correct the value of the radial clearance in the bearing, it is necessary to use new bearing shells or shells with a different color marking. Tighten the connecting rod cap bolts in three steps as above.